Business Logo Design for UK HR services company

I am working a redesign for an established UK-based company based in the UK. The company provides payroll services to workers in multiple industries including education, construction, healthcare etc.

The company has 2 audiences:
1 - the worker who is being paid
2 - the companies who the worker is working for

I'm redefining the company values, purpose and mission currently and once finalised these will be available as part of this brief. A suggested palette will also be provided along with references for other liked logos / brands.

I am looking for support to:

- produce 4 logo concepts
- mockups showing each concept logo on a website, mug and brochure
- 2 rounds of amends after the first submission to the client
- The final logo files will be required in .svg, .jpg, .png, eps, ai, pdf formats.

If you're interested in the project, please provide:

- relevant case studies of other UK B2B logos you have designed
- an indication of timescales to produce
- any further information you need about the project

UK-based designers and those working on UK time zones are preferred.